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* craft-tiff: keep shared child IFDs and every string of a multi-string ASCII value Two pointers to the same child IFD (two SubIFDs entries, or an Exif IFD shared by two directories) were treated as a loop and the second was dropped. Loops are now detected on the current parent path only; a shared IFD is parsed once and copied for later pointers, and each copy is charged its IFDs, entries and value bytes so max_ifds, max_entries_total and the value budget still hold. ASCII values keep every NUL-separated string (Value::as_strings); as_str and as_bytes return the first. Ported from storytold/lightcraft#3002. * craft-tiff: parse_with_status reports whether the whole IFD structure was read The reader is best effort: truncated tables, over-budget values, dangling pointers and unfollowed children are skipped silently. A caller that must tell a clean absence from something it could not inspect (a privacy scan for GPS data) gets the same tree plus a completeness flag. Also adds the PHOTOSHOP_IMAGE_RESOURCES and GPS destination tag constants. Ported from storytold/lightcraft#3766. On top of the shared-child change, a second pointer to an IFD already read counts as read, and a next pointer that loops back to the chain is incomplete. --------- Co-authored-by: Andrew Frahn <andrew@emmertex.com> Co-authored-by: ronibalthazar <61232335+ronibalthazar@users.noreply.github.com>